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December 21, 2014

December 21, 2014

Posted by **Anonymous** on Monday, November 4, 2013 at 11:26pm.

a. y = (x - 2)^2 - 1

b. x + y = 6

c. y = |x| -3

d. y = x^2 + 1

How am I supposed to graph these?

2. For each function, determine whether the given points are on the graph.

a. y = 7x - 2; (1, 5) and (2, 10)

- Algebra 1 (Reiny or Kuai)--Please, help me! -
**Anonymous**, Tuesday, November 5, 2013 at 12:08amCan anyone help me?

- Algebra 1 (Reiny or Kuai) -
**Reiny**, Tuesday, November 5, 2013 at 8:06ammake a table of values for each, plot the points and join them with smooth curves for the 1st and last.

The 1st and last are parabolas, the first has a vertex at (2,-1), the last one has a vertex at (0,1)

Both open up

the other two are linear , that is, straight lines, but

the y = |x| -3 lies all above the x-axis

I suggest graphing y = x , then reflecting the part which falls below the x-axis in the x-axis then moving the curve down by 3 units

see:

http://www.wolframalpha.com/input/?i=plot+y+%3D+%7Cx%7C+-+3

One of my favourite webpages, simply change the equation for the others.

- correction - Algebra 1 (Reiny or Kuai) -
**Reiny**, Tuesday, November 5, 2013 at 8:09amThe line

" the y = |x| - 3 lies all above the x-axis" is not correct,

should have said

"the y = |x| - 3 lies all above -3 "

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